Can you think of any three-dimensional shape that comprises of exactly two surfaces?

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

The dirtier I get, the whiter I look. Who am I?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

Trying to tease Birbal, Akbar gave him one gold coin and ask him to buy
* something for him to eat
* something for him to drink.
* something to feed the cows
* something to plant in the garden
and most important you need to buy only one thing.

What must Birbal buy to silence Akbar?

Andrew’s doctor gives him three pills and tells him to take one every half hour. How much time will have passed by the time Andrew’s taken all three pills?

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.

In two decks of cards, what is the least amount of cards you must take to be *guaranteed* at least one four-of-a-kind?

A man stands on one side of a river, his dog on the other. The man calls his dog, who immediately crosses the river without getting wet and without using a bridge or a boat. How did the dog do it?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?